Made API to UnscheduledHander const

[Dr15Jones]

Changed member functions which would be called from multiple threads simultaneously const in order to distinguish them from the members which are only going to be called serially. This should aid in checking for thread-safety.
A needed followup will be to make Worker thread-safe.

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for CMSSW_8_0_X.

It involves the following packages:

FWCore/Framework

@cmsbuild, @smuzaffar, @Dr15Jones, @davidlange6 can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @wddgit, @wmtan this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

Following commands in first line of a comment are recognized

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• [@cmsbuild,] please test: L1/L2 and selected users to start jenkins tests
• [@cmsbuild,] please test with cms-sw/cmsdist#<PR>: L1/L2 and selected users to start jenkins tests using externals from cmsdist

[Dr15Jones]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10329/console

[Dr15Jones]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_0_X IBs after it passes the integration tests. This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[cmsbuild]

-1

Tested at: e7b0182
I found errors in the following unit tests:

---> test runtestRecoLocalCaloHGCalRecProducers had ERRORS
---> test runtestSimCalorimetryHGCalSimProducers had ERRORS

you can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12811/10329/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
37383df
26a7757
222d08c
6ce2e14
e5d6918
08d667f
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12811/10329/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12811/10329/git-merge-result

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12811/10329/summary.html